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From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Thu,  9 Jul 2015 09:24:12 +0200
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Subject: [PATCH 08/13] video: Add MTL017 LVDS encoder support
To: Barebox List <barebox@lists.infradead.org>

The MTL017 is found on the Efika Smartbook. Not much is known about
this chip, so this driver only programs a register dump which is suitable
for some panels.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/video/Kconfig  |   9 ++
 drivers/video/Makefile |   1 +
 drivers/video/mtl017.c | 280 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 290 insertions(+)
 create mode 100644 drivers/video/mtl017.c

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 6d540a5..6637877 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -108,4 +108,13 @@ config DRIVER_VIDEO_BACKLIGHT_PWM
 	help
 	  Enable this to get support for backlight devices driven by a PWM.
 
+comment "Video encoder chips"
+
+config DRIVER_VIDEO_MTL017
+	bool "MTL017 LVDS encoder"
+	select VIDEO_VPL
+	help
+	  The MTL017 is a parallel to lvds video encoder chip found on the
+	  Efika MX Smartbook.
+
 endif
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 3aa544a..1e2109e 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_OFDEVICE) += of_display_timing.o
 obj-$(CONFIG_DRIVER_VIDEO_BACKLIGHT) += backlight.o
 obj-$(CONFIG_DRIVER_VIDEO_BACKLIGHT_PWM) += backlight-pwm.o
 obj-$(CONFIG_VIDEO_VPL) += vpl.o
+obj-$(CONFIG_DRIVER_VIDEO_MTL017) += mtl017.o
 
 obj-$(CONFIG_DRIVER_VIDEO_ATMEL) += atmel_lcdfb.o atmel_lcdfb_core.o
 obj-$(CONFIG_DRIVER_VIDEO_ATMEL_HLCD) += atmel_hlcdfb.o atmel_lcdfb_core.o
diff --git a/drivers/video/mtl017.c b/drivers/video/mtl017.c
new file mode 100644
index 0000000..1a1f686
--- /dev/null
+++ b/drivers/video/mtl017.c
@@ -0,0 +1,280 @@
+/*
+ * (C) Copyright 2014 Sascha Hauer, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <common.h>
+#include <init.h>
+#include <driver.h>
+#include <xfuncs.h>
+#include <errno.h>
+#include <regulator.h>
+#include <of_gpio.h>
+#include <gpio.h>
+#include <fb.h>
+#include <video/vpl.h>
+
+#include <i2c/i2c.h>
+
+struct mtl017 {
+	struct vpl vpl;
+	struct device_d *dev;
+	struct i2c_client *client;
+	u8 *regs;
+	int enable_gpio;
+	int enable_active_high;
+	int reset_gpio;
+	int reset_active_high;
+	struct regulator *regulator;
+};
+
+/*
+ * Unfortunately we know nothing about the mtl017 except the following
+ * register tables which are derived from the Efika kernel. The displays
+ * provide EDID data, but this does not work with the mtl017 or at least
+ * not with the below register settings, so we have to provide hardcoded
+ * modelines and use the EDID data only to match against the vendor/display.
+ */
+static u8 mtl017_44_54_tbl[] = {
+	/* 44M to 53.9M */
+	0x00, 0x20, 0xAF, 0x59, 0x2B, 0xDE, 0x51, 0x00,
+	0x00, 0x04, 0x17, 0x00, 0x58, 0x02, 0x00, 0x00,
+	0x00, 0x3B, 0x01, 0x08, 0x00, 0x1E, 0x01, 0x05,
+	0x00, 0x01, 0x72, 0x05, 0x32, 0x00, 0x00, 0x04,
+	0x00, 0x00, 0x20, 0xA8, 0x02, 0x12, 0x00, 0x58,
+	0x02, 0x00, 0x00, 0x02, 0x00, 0x00, 0x02, 0x00,
+	0x00, 0x02, 0x10, 0x01, 0x68, 0x03, 0xC2, 0x01,
+	0x4A, 0x03, 0x46, 0x00, 0xF1, 0x01, 0x5C, 0x04,
+	0x08, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x3A,
+	0x18, 0x4B, 0x29, 0x5C, 0xDE, 0xF6, 0xE0, 0x1C,
+	0x03, 0xFC, 0xE3, 0x1F, 0xF3, 0x75, 0x26, 0x45,
+	0x4A, 0x91, 0x8A, 0xFF, 0x3F, 0x83, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x4E, 0x48,
+	0x00, 0x01, 0x10, 0x01, 0x00, 0x00, 0x10, 0x04,
+	0x02, 0x1F, 0x00, 0x00, 0x00, 0x0A, 0x00, 0x00,
+	0x32, 0x00, 0x00, 0x04, 0x12, 0x00, 0x58, 0x02,
+	0x02, 0x7C, 0x04, 0x98, 0x02, 0x11, 0x78, 0x18,
+	0x30, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+};
+
+#define REGMAP_LENGTH (sizeof(mtl017_44_54_tbl) / sizeof(u8))
+#define BLOCK_TX_SIZE 32
+
+struct mtl017_panel_info {
+	char *manufacturer;
+	char *product_name;
+	struct fb_videomode *mode;
+	u8  *regs;
+};
+
+
+static struct fb_videomode auo_bw101aw02_mode = {
+	.name = "AUO B101AW02 1024x600",
+	.refresh = 60,
+	.xres = 1024,
+	.yres = 600,
+	.pixclock = 22800,
+	.left_margin = 80,
+	.right_margin = 40,
+	.upper_margin = 21,
+	.lower_margin = 21,
+	.hsync_len = 4,
+	.vsync_len = 4,
+	.vmode = FB_VMODE_NONINTERLACED,
+};
+
+static struct mtl017_panel_info panels[] = {
+	{
+		.manufacturer = "AUO",
+		.product_name = "B101AW02 V0",
+		.mode = &auo_bw101aw02_mode,
+		.regs = mtl017_44_54_tbl,
+	},
+	{
+		.manufacturer = "CMO",
+		.product_name = "N101L6-L0D",
+		.mode = &auo_bw101aw02_mode,
+		.regs = mtl017_44_54_tbl,
+	},
+};
+
+static int mtl017_get_videomodes(struct mtl017 *mtl017, struct display_timings *timings)
+{
+	int ret, i;
+
+	ret = vpl_ioctl(&mtl017->vpl, 1, VPL_GET_VIDEOMODES, timings);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(panels); i ++) {
+		if (memcmp(timings->edid + 0x71, panels[i].product_name,
+					strlen(panels[i].product_name)))
+			continue;
+
+		dev_dbg(mtl017->dev, "found LCD Panel: %s %s\n",
+				panels[i].manufacturer,
+				panels[i].product_name);
+		mtl017->regs = panels[i].regs;
+
+		timings->modes[0].name =  panels[i].mode->name;
+		timings->modes[0].refresh =  panels[i].mode->refresh;
+		timings->modes[0].xres =  panels[i].mode->xres;
+		timings->modes[0].yres =  panels[i].mode->yres;
+		timings->modes[0].pixclock =  panels[i].mode->pixclock;
+		timings->modes[0].left_margin =  panels[i].mode->left_margin;
+		timings->modes[0].right_margin =  panels[i].mode->right_margin;
+		timings->modes[0].upper_margin =  panels[i].mode->upper_margin;
+		timings->modes[0].lower_margin =  panels[i].mode->lower_margin;
+		timings->modes[0].hsync_len =  panels[i].mode->hsync_len;
+		timings->modes[0].vsync_len =  panels[i].mode->vsync_len;
+		timings->num_modes = 1;
+	}
+
+	return 0;
+}
+
+static int mtl017_enable(struct mtl017 *mtl017)
+{
+	int i;
+	int ret;
+	int retry = 5;
+	u8 *reg_tbl = mtl017->regs;
+
+	dev_dbg(mtl017->dev, "Initializing MTL017 LVDS Controller\n");
+
+	ret = regulator_enable(mtl017->regulator);
+	if (ret)
+		return ret;
+
+	gpio_direction_output(mtl017->reset_gpio, mtl017->reset_active_high);
+	mdelay(5);
+	gpio_direction_output(mtl017->reset_gpio, !mtl017->reset_active_high);
+	mdelay(5);
+	gpio_direction_output(mtl017->enable_gpio, mtl017->enable_active_high);
+
+	/* Write configuration table */
+	for (i = 0; i < REGMAP_LENGTH; i+=BLOCK_TX_SIZE) {
+retry:
+		mdelay(1);
+		ret = i2c_smbus_write_i2c_block_data(mtl017->client, i, BLOCK_TX_SIZE, &(reg_tbl[i]));
+		if (ret < 0) {
+			dev_warn(mtl017->dev, "failed to initialize: %d\n", ret);
+			if (retry-- > 0)
+				goto retry;
+			return -EIO;
+		}
+	}
+
+	return 0;
+}
+
+static int mtl017_ioctl(struct vpl *vpl, unsigned int port,
+			unsigned int cmd, void *ptr)
+{
+	struct mtl017 *mtl017 = container_of(vpl,
+			struct mtl017, vpl);
+	int ret = 0;
+
+	switch (cmd) {
+	case VPL_PREPARE:
+		dev_dbg(mtl017->dev, "VPL_PREPARE\n");
+		goto forward;
+	case VPL_ENABLE:
+		dev_dbg(mtl017->dev, "VPL_ENABLE\n");
+
+		ret = mtl017_enable(mtl017);
+		if (ret < 0)
+			break;
+
+		goto forward;
+	case VPL_DISABLE:
+		dev_dbg(mtl017->dev, "VPL_DISABLE\n");
+
+		goto forward;
+	case VPL_GET_VIDEOMODES:
+		dev_dbg(mtl017->dev, "VPL_GET_VIDEOMODES\n");
+
+		ret = mtl017_get_videomodes(mtl017, ptr);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+
+forward:
+	return vpl_ioctl(&mtl017->vpl, 1, cmd, ptr);
+}
+
+static int mtl017_probe(struct device_d *dev)
+{
+	struct mtl017 *mtl017;
+	int ret;
+	enum of_gpio_flags flags;
+
+	mtl017 = xzalloc(sizeof(struct mtl017));
+	mtl017->vpl.node = dev->device_node;
+	mtl017->vpl.ioctl = mtl017_ioctl;
+	mtl017->dev = dev;
+	mtl017->client = to_i2c_client(dev);
+	mtl017->regulator = regulator_get(dev, "vdd");
+
+	mtl017->enable_gpio = of_get_named_gpio_flags(dev->device_node,
+			"enable-gpios", 0, &flags);
+	if (gpio_is_valid(mtl017->enable_gpio)) {
+		if (!(flags & OF_GPIO_ACTIVE_LOW))
+			mtl017->enable_active_high = 1;
+	}
+
+	mtl017->reset_gpio = of_get_named_gpio_flags(dev->device_node,
+			"reset-gpios", 0, &flags);
+	if (gpio_is_valid(mtl017->reset_gpio)) {
+		if (!(flags & OF_GPIO_ACTIVE_LOW))
+			mtl017->reset_active_high = 1;
+	}
+
+	ret = vpl_register(&mtl017->vpl);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static struct driver_d twl_driver = {
+	.name  = "mtl017",
+	.probe = mtl017_probe,
+};
+
+static int mtl017_init(void)
+{
+	i2c_driver_register(&twl_driver);
+	return 0;
+}
+
+device_initcall(mtl017_init);
-- 
2.1.4


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